Hydraulic pressure supplying device for transmission

Abstract

In a hydraulic pressure supplying device for a transmission including a first oil pump adapted to be driven by a main shaft of the transmission, at least one second oil pump adapted to be driven by suitable means, and a check valve provided between the discharge side of the first oil pump and the discharge side of the second oil pump to prevent the flow of oil from the first oil pump to the second oil pump, a first filter is provided between the second oil pump and the check valve.

1. A hydraulic pressure supplying device for a transmission, comprising:
 a first oil pump adapted to be driven by a main shaft of said transmission; 
 at least one second oil pump adapted to be driven by suitable means; 
 a check valve provided between the discharge side of said first oil pump and the discharge side of said second oil pump to prevent the flow of oil from said first oil pump to said second oil pump; 
 a first filter provided between said second oil pump and said check valve; 
 second filter provided between said first oil pump and said check valve; and 
 a delivery pipe connected to the discharge side of said second oil pump, said delivery pipe having said check valve and said first and second filters provided therein, 
 wherein an oil pump base of said second oil pump is mounted on a transmission case such that a cavity is formed between said transmission case and said oil pump base when said oil pump base is mounted, 
 wherein said cavity is defined by a first mounting hole, formed in said transmission case, said first mounting hole having a first diameter, and a second mounting hole, formed in said oil pump base, said second mounting hole having a second diameter, 
 wherein said delivery pipe is removably mounted in said cavity, 
 wherein said second diameter is smaller than said first diameter, 
 wherein said delivery pipe has a shoulder portion connecting a large-diameter portion and a small-diameter portion, 
 wherein said large-diameter portion is fitted in said first mounting hole and said small-diameter portion is fitted in said second mounting hole, and 
 wherein said second oil pump and said delivery pipe are removably mountable directly on said transmission case from outside of said transmission. 
 
   
   
     2. The hydraulic pressure supplying device according to  claim 1 , further comprising a strainer provided in said transmission and a third filter provided between said second oil pump and said strainer. 
   
   
     3. The hydraulic pressure supplying device according to  claim 2 , further comprising a suction pipe connected to the suction side of said second oil pump;
 said third filter being provided in said suction pipe. 
 
   
   
     4. The hydraulic pressure supplying device according to  claim 3 ,
 wherein said oil pump base is mounted on said transmission case such that a second cavity is formed between said transmission case and said oil pump base when said oil pump base is mounted, 
 wherein said second cavity is defined by a third mounting hole, formed in said transmission case, and a fourth mounting hole, formed in said oil pump base, 
 wherein said suction pipe is removably mounted in said second cavity, and 
 wherein said suction pipe is removably mountable on said transmission case from the outside of said transmission.